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Effect of Carrier Gas Pressure on the Size of Cu Nanoparticles Prepared by ELM Method

Shahbazi, Bahador | 2017

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  1. Type of Document: M.Sc. Thesis
  2. Language: English
  3. Document No: 49794 (56)
  4. University: Sharif University of Technology, International Campus, Kish Island
  5. Department: Science and Engineering
  6. Advisor(s): Halali, Mohammad
  7. Abstract:
  8. In this report the important factors affecting the levitation melting of copper are discussed. Pure copper nanoparticles were synthesized by utilizing an Electromagnetic Levitation Melting Gas Condensation (ELM-GC) method. Pure bulk copper samples were melted and evaporated by electromagnetic levitation technique in an inert gas atmosphere in a silica tube. Copper nanoparticles were formed from ascending vapor by employing high purity argon and helium as carrier gases and cooling agents. The pressure of inert gas was changed in both helium and argon atmospheres to investigate on pressure’s effect. Particle size and morphology of the produced nanoparticles were studied by Field Emission Scanning Electron Microscopy (FE-SEM) and Dynamic Light Scattering (DLS) analysis. Results showed almost spherical nanoparticles with a narrow size distribution under both cooling atmospheres. The purity of the produced copper nanoparticles was confirmed through powder X-ray diffraction (XRD) as well as Energy Dispersive X-ray Analysis (EDAX), and Atomic Absorption Spectroscopy (AAS) analysis. As to the impact of carrier gas, copper nanoparticles synthesized under helium atmosphere had smaller particle size with narrower particle size distribution compared to those produced in argon, because of its higher thermal conductivity. Also pressure reduction resulted in decreasing the particle size because of less time of particle grows. The average particle size of synthesized copper nanoparticles under Ar and He atmospheres were about 50 and 30 nm, respectively
  9. Keywords:
  10. Nanoparticles ; Pressure ; Electromagnetic Levitation ; Gas Condensate ; Copper Nanoparticles ; Melting

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